Electron tube



Nov. 22, 1938.

ELECTRON TUBE Filed Marchl 16, 1937 orney Patented Nov. 22, 1938 UNITED STATES ELECTRON TUBE Alfred Gaebel, Berlin, Germany, assigner to C. Lorenz Aktiengesellschaft, Berlin-Tempelhof,

Germany, a company Application March 16, 1937, Serial No. 131,187 In Germany March 16, 1936 3 Claims.

It is frequently necessary to position the electrodes of electron tubes by means of an insulating plate or disc. In this connection it has been customary to insert extensions of the electrodes 5 into bores provided in such insulating disc and in this way to secure the electrodes in their mutual position. The accuracy of this mutual position and the stableness of the arrangement depend more or less on the accuracy cared for in providing the bores in the insulating disc. Therefore the accuracy thus obtained does not amount to the high standard required especially in the case of tubes intended for use in connection with very high frequencies, such as decimeter Waves and the like. In addition, this known method renders the manufacture somewhat troublesome.

The invention has for its object to render the mutual position of the electrodes independent of the accuracy observed in producing the bores in the insulating disc. To such end this disc is fitted with means that allow of welding the electrodes thereto, as will be understood from the following description and be particularly pointed out in the appended claims, reference being had to the accompanying drawing in which Fig. 1 is a somewhat diagrammatic elevation of an arrangement as provided by the invention. Fig. 2 is a sectional detail view, drawn to a larger scale than Fig. 1, and illustrates an example of the means with which the insulating disc is fitted for welding the electrodes to it. Fig. 3 is a somewhat diagrammatic and partially sectioned elevation of a modification of the arrangement shown in Fig. 1. Fig. 4 is a plan view to Fig. 3.

The electrodes represented by way of example are two electrodes I which may be plate-shaped, as shown, or may be of any other suitable or desired configuration. Each electrode has a rightangled extension 2 which is welded at 3 to a rivet 4 disposed in an insulating disc 5 from which the electrodes are suspended in this way. Disc 5 may be made of mica, for instance. The extensions 2 may be formed integral with the electrodes or may be a Wire or tape fastened thereto by welding, for example.

The rivets 4 may be of any suitable construction. For instance, as shown in Fig. 2, they may consist of a pin 'p provided with a head h, further of a ring 1', and a head q which is formed by in- (Cl. Z50-27.5)

serting the pin p after ring 1' has been inserted over this pin.

In prior arrangements the extensions 2 are inserted in bores of the disc 5 after bending them accordingly, such bores for instance being those 5 now taken up by the rivets 4. In the novel arrangement however the extensions 2 are by the described welding secured flatwise to disc 5. As a result the electrodes can be assembled and fastened to disc 5 with the aid of a gauge in order 10 to provide for the desirable accuracy of their mutual position. Inaccuracies inherent to the said bores, or even to the rivets 4, thus have no inuence upon the positioning of the electrodes since such inaccuracies do not predetermin'e the 15 location of the welding spots 3.

In the arrangement shown in Fig. 1 the welding spots 3 are facing the electrodes I, whilst in Figs. 3 and 4 they are arranged on the opposite side of the disc 5 from the electrodes, the exten- 20 sions 2 reaching through a central opening 6 of the disc 5. As a result the welding in the case of Figs. 3 and 4 is easier to effect than in the case of Fig. l, since in Figs. 3 and 4 the welding spots 3 are more. readily accessible than in Fig. 1. 25

The arrangement represented in Figs. 3 and 4 is such that it is possible also to weld supporting members 'l to the same rivets 4 to which the extensions 2 are welded.

As shown in Fig. 4, disc 5 may have more than 30 two rivets 4 in order that still other electrodes or other parts of the electron tube can be xed to disc 5 in the described manner.

What is claimed is:

1. An electron tube comprising a plurality of 35 electrodes, an insulating disc, rivets disposed in said disc and extensions carried by said electrodes atly welded to the heads of said rivets.

2. A system according to claim 1 wherein supporting members are welded to the heads of the 40 rivets which are facing the electrodes.

3. An electrode structure for electron tubes comprising electrodes, extensions carried by said electrodes, an insulating disc having an opening through which said extensions pass and rivets 45 extending through said disc, said extensions being flatly welded to said rivets on the side of said disc remote from said electrodes.

ALFRED GAEBEL. 50 

